pip3:tldr:f279e

This command is used in command-line interface (CLI) to generate a text file listing all the Python packages installed in the current environment.

• pip3 is the command used to manage Python packages in Python version 3 and is a commonly used package installer for Python.
• freeze is an argument that tells pip3 to output a list of installed packages along with their version numbers.
• > is the output redirection operator in the command-line interface. It is used to redirect the output of a command to a file instead of displaying it in the terminal.
• ${requirements-txt} is the name of the file where the output will be redirected. It could be any name, but in this case, it suggests that the output will be stored in a file named requirements.txt.

In summary, running this command will list all the installed Python packages along with their versions and store them in a file named requirements.txt. This file can be later used to recreate the environment by installing the same set of packages.